CN209357068U - NFC circuit and terminal device - Google Patents
NFC circuit and terminal device Download PDFInfo
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- CN209357068U CN209357068U CN201920227600.XU CN201920227600U CN209357068U CN 209357068 U CN209357068 U CN 209357068U CN 201920227600 U CN201920227600 U CN 201920227600U CN 209357068 U CN209357068 U CN 209357068U
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Abstract
The utility model discloses a kind of NFC circuit and terminal device, wherein, NFC circuit includes main control chip, NFC read-write chip and NFC antenna circuit, the model MT6580 of main control chip, NFC signal communication is mutually carried out between NFC antenna circuit and the NFC device of outside, NFC read-write chip when establishing connection with external NFC device feedback link signal to main control chip, the connection signal correspondence that main control chip is fed back according to NFC read-write chip outputs control signals to NFC read-write chip, to control the read-write operation that NFC read-write chip carries out NFC signal, to realize the NFC function of NFC circuit and external equipment.
Description
Technical field
The utility model relates to NFC technique field, in particular to a kind of NFC circuit and terminal device.
Background technique
Near-field communication (Near Field Communication, NFC) technology is by non-contact radio-frequency identification (Radio
Frequency Identification, RFID) and interconnection and interflow technology integration be evolved, it can satisfy any two without
The information exchange of line equipment room, access to content, service exchange, as long as and use it is more easy --- any two equipment is close
It is patched without cable, so that it may realize mutual communication.NFC technique and mobile phone or other mobile devices and all kinds of banks
The combination of card and contactless card, keeps NFC very widely used.Currently, there are mobile payment, electronic ticket in main field to be applied
Business, gate inhibition, mobile identification, anti-fake etc..NFC is using 13.56MHz as short-range communication frequency standard, compatible ISO
14443, the radio frequency standards such as ISO 15693, Felica.
Currently, only corresponding some high-end NFC circuits just support NFC function, end terminal equipment is as MT6580
Low-end platform seldom support NFC function.
Utility model content
The main purpose of the utility model is to provide a kind of NFC circuit, it is intended to which solving MTK6580 platform cannot achieve NFC
The problem of function.
To achieve the above object, the utility model proposes NFC circuit include main control chip, NFC read-write chip and NFC days
Line circuit, the model MT6580 of the main control chip；
The main control chip, the NFC read-write chip and the NFC antenna circuit are sequentially connected；
The NFC antenna circuit, for mutually carrying out NFC signal communication between external NFC device；
The NFC read-write chip, for when establishing connection with external NFC device feedback link signal to the master control
Chip；
The main control chip, the connection signal correspondence for being fed back according to the NFC read-write chip are output control signals to
The NFC read-write chip, to control the read-write operation that the NFC read-write chip carries out NFC signal.
Optionally, the NFC antenna circuit includes NFC conditioning circuit and antenna, and the NFC conditioning circuit is connected to described
Between NFC read-write chip and the antenna；
The antenna, for transmitting NFC signal by near-field coupling and external NFC circuit；
The NFC conditioning circuit, for carrying out impedance matching and filtering processing to the NFC signal.
Optionally, the NFC read-write chip be equipped with power end, clock signal terminal, data signal end, interrupt signal end,
Reset signal end, the first auxiliary end, the second auxiliary end, the first radio frequency reception end, the first radio frequency transmitting terminal, the second radio frequency reception
End, the second radio frequency transmitting terminal, the clock signal terminal, the data signal end, the interrupt signal end and the reset signal
End is connect with the signal end of the main control chip respectively, and first auxiliary end, second auxiliary end, first radio frequency connect
Receiving end, the first radio frequency transmitting terminal, second radio frequency reception end, the second radio frequency transmitting terminal respectively with the NFC tune
Manage circuit connection.
Optionally, the NFC read-write chip model ST21NFCD.
Optionally, the NFC conditioning circuit includes first antenna terminal, the second antenna terminal, first resistor, the second electricity
Resistance, 3rd resistor, the 4th resistance, first capacitor, the second capacitor, third capacitor, the 4th capacitor, the 5th capacitor, the 6th capacitor,
Seven capacitors, the 8th capacitor, the 9th capacitor, the tenth capacitor, the 11st capacitor, the first inductance and the second inductance；
The first end of the first resistor is connect with first radio frequency reception end, the first end of first inductance and institute
State the connection of the first radio frequency transmitting terminal, the second end of first inductance, the second end of the first resistor, the first capacitor
The first end of first end, the first end of the third capacitor and the 4th capacitor interconnects, the first end of the second resistance with
The connection of second radio frequency reception end, the first end of second inductance are connect with the second radio frequency transmitting terminal, and described second
The second end of resistance, the second end of second inductance, the first end of second capacitor, the first end of the 5th capacitor and
The second end of 6th capacitor interconnects, and the second end of second capacitor and the second end of the first capacitor are grounded, institute
State the second end of third capacitor, the second end of the 4th capacitor, the first end of the 7th capacitor, the 8th capacitor
One end, the first end of the 9th capacitor, the first end of the 3rd resistor and first antenna terminal interconnection, the described 5th
The second end of capacitor, the second end of the 6th capacitor, the second end of the 9th capacitor, the first end of the tenth capacitor,
First end, the second end of the 3rd resistor and second antenna terminal interconnection of 11st capacitor, the 7th electricity
The second end of appearance, the second end of the 8th capacitor, the first end of the 4th resistance and first auxiliary end interconnection, it is described
The second end of tenth capacitor, the second end of the 11st capacitor, the second end of the 4th resistance and second auxiliary end
Interconnection.
Optionally, the NFC circuit further includes NFC interface circuit, and the NFC interface circuit includes NFC interface and power supply
Circuit, the NFC read-write chip are connect with the main control chip and the power circuit respectively through the NFC interface；
The power circuit, for exporting DC power supply to the NFC read-write chip.
Optionally, the power circuit includes the 12nd capacitor, the 13rd capacitor and voltage-stablizer, the 12nd capacitor
The power input of first end, the power end of power circuit and the voltage-stablizer interconnects, the first end of the 13rd capacitor, institute
State the power output end interconnection of the power output end and the power circuit of voltage-stablizer, the second end of the 12nd capacitor, institute
The ground terminal of the second end and the voltage-stablizer of stating the 13rd capacitor is grounded.
The utility model also proposes that a kind of terminal device, including NFC circuit as described above, the NFC circuit include master
Control chip, NFC read-write chip and NFC antenna circuit, the model MT6580 of the main control chip；
The main control chip, the NFC read-write chip and the NFC antenna circuit are sequentially connected；
The NFC antenna circuit, for mutually carrying out NFC signal communication between external NFC device；
The NFC read-write chip, for when establishing connection with external NFC device feedback link signal to master control core
Piece；
The main control chip, the connection signal correspondence for being fed back according to the NFC read-write chip are output control signals to
The NFC read-write chip, to control the read-write operation that the NFC read-write chip carries out NFC signal.
Technical solutions of the utility model are by using main control chip, NFC read-write chip and NFC antenna circuit composition NFC electricity
It is logical mutually to carry out NFC signal by road, the model MT6580 of the main control chip between NFC antenna circuit and the NFC device of outside
News, NFC read-write chip when establishing connection with external NFC circuit feedback link signal to main control chip, main control chip according to
The connection signal correspondence of NFC read-write chip feedback outputs control signals to NFC read-write chip, to control the progress of NFC read-write chip
The read-write operation of NFC signal, to realize the NFC function between NFC circuit and external NFC devices.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the module diagram of one embodiment of the utility model NFC circuit；
Fig. 2 is the module diagram of another embodiment of the utility model NFC device；
Fig. 3 is the electrical block diagram of one embodiment of NFC read-write chip in the utility model NFC circuit；
Fig. 4 is the electrical block diagram of one embodiment of NFC conditioning circuit in the utility model NFC circuit；
Fig. 5 is the electrical block diagram of the another embodiment of the utility model NFC circuit；
Fig. 6 is the electrical block diagram of one embodiment of power circuit in the utility model NFC circuit.
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, fall within the protection scope of the utility model.
It is to be appreciated that the description for being related to " first ", " second " etc. in the present invention is used for description purposes only, and cannot
It is interpreted as its relative importance of indication or suggestion or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include at least one of the features.In addition, the "and/or" occurred in full text
Meaning are as follows: including three schemes arranged side by side, by taking " A/B " as an example, including the side that A scheme or B scheme or A and B meet simultaneously
Case in addition, the technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
It is enough realize based on, will be understood that the knot of this technical solution when conflicting or cannot achieve when occurs in the combination of technical solution
Conjunction is not present, also not within the protection scope of the requires of the utility model.
The utility model proposes a kind of NFC circuits.
As shown in FIG. 1, FIG. 1 is the module diagram of one embodiment of the utility model NFC circuit, NFC circuit includes master control
Chip U1, NFC read-write chip U2 and NFC antenna circuit 10, the model MT6580 of the main control chip U1；
The main control chip U1, the NFC read-write chip U2 and the NFC antenna circuit 10 are sequentially connected；
The NFC antenna circuit 10, for mutually carrying out NFC signal communication between external NFC device；
The NFC read-write chip U2, for when establishing connection with external NFC device feedback link signal to the master
Control chip U1；
The main control chip U1, the corresponding output control letter of connection signal for being fed back according to the NFC read-write chip U2
Number to the NFC read-write chip U2, to control the read-write operation that the NFC read-write chip U2 carries out NFC signal.
In the present embodiment, main control chip U1 model MT6580, MT6580 in NFC circuit are a highly integrated bases
Band includes modem and application processing system.Four cores of the integrated chip, and support different startup interfaces, including simultaneously
The performance of row nand flash memory or EMMC and 32 LPDDR2 or LPDDR3 optimization, in addition, can also connect peripheral equipment includes camera shooting
Head interface, touch screen shows, SD card etc..
Main control chip U1 internal preset NFC algorithm, main control chip U1 are led to by I2C interface and NFC read-write chip U2
News, NFC read-write chip U2 through NFC antenna circuit 10 with external NFC devices when connecting, NFC read-write chip U2 output connection letter
Number to main control chip U1, main control chip U1 is reminded to have information to need to handle, main control chip U1 is fed back according to NFC read-write chip U2
Connection signal output control signals to NFC read-write chip U2 carry out information processing, such as output reset signal, initializing signal,
Read-write, switching signal etc., the operating mode that NFC circuit can be carried out with external NFC device include read-write mode, point-to-point
Transmission mode and intelligent mode card.
Antenna 12 in NFC antenna circuit 10 transmits electromagnetic signal by near-field coupling and external NFC circuit, external
NFC device includes mobile terminal, smart card etc., and NFC antenna circuit 10 sends and receives NFC signal, and corresponding progress
Conditioning, including filtering and impedance matching etc..
Technical solutions of the utility model are formed by using main control chip U1, NFC read-write chip U2 and NFC antenna circuit 10
NFC circuit, the model MT6580 of the main control chip U1 are mutually carried out between NFC antenna circuit 10 and the NFC device of outside
NFC signal communication, NFC read-write chip U2 when establishing connection with external NFC device feedback link signal to main control chip U1,
The connection signal correspondence that main control chip U1 is fed back according to NFC read-write chip U2 outputs control signals to NFC read-write chip U2, with control
NFC read-write chip U2 processed carries out the read-write operation of NFC signal, to realize the NFC function between NFC circuit and external equipment.
As shown in Fig. 2, Fig. 2 is the module diagram of another embodiment of the utility model NFC device, and in the present embodiment, institute
Stating NFC antenna circuit 10 includes NFC conditioning circuit 11 and antenna 12, and the NFC conditioning circuit 11 is connected to the NFC read-write core
Between piece U2 and the antenna 12；
The antenna 12, for transmitting the NFC signal by near-field coupling and external NFC device；
The NFC conditioning circuit 11, for carrying out impedance matching and filtering processing to the NFC signal.
NFC antenna 12 is generally by coiling/printing/circuit coil of etch process production and the ferrite material of anti-interference ability
Material composition establishes connection by near-field coupling and external NFC device, and carries out the transmission of signal.
NFC conditioning circuit 11 is used to carry out NFC signal impedance matching and filtering, parallel/series in NFC conditioning circuit 11
Resistance is used to adjust Q value/bandwidth of antenna 12, and parallel/series capacitor is used to debug the resonance frequency and input impedance of antenna 12.
As shown in figure 3, Fig. 3 is the circuit structure signal of one embodiment of NFC read-write chip in the utility model NFC circuit
Scheme, in the present embodiment, the NFC read-write chip U2 is equipped with power end VCC, clock signal terminal S_SCL, data signal end S_
SDA, interrupt signal end NFC_EINT, reset signal end NFC_RST, the first auxiliary end CDMP1, the second auxiliary end CDMP2, first
Radio frequency transmitting terminal RFO1, the first radio frequency reception end RFI1, the second radio frequency transmitting terminal RFO2, the second radio frequency reception end RFI2, it is described
Clock signal terminal S_SCL, the data signal end S_SDA, the interrupt signal end NFC_EINT and the reset signal end
NFC_RST is connect with the signal end of the main control chip U1 respectively, the first auxiliary end CDMP1, second auxiliary end
CDMP2, the first radio frequency transmitting terminal RFO1, first radio frequency reception end RFI1, the second radio frequency transmitting terminal RFO2, institute
The second radio frequency reception end RFI2 is stated to connect with the NFC conditioning circuit 11 respectively.
In the present embodiment, NFC read-write chip U2 carries out control letter through clock signal terminal S_SCL and data signal end S_SDA
Number transmission, such as CPU to NFC chip carry out initialization definitions, read-write operation, open and close etc., interrupt signal end NFC_
EINT is used for transmission interrupt signal, and NFC read-write chip U2 exports interrupt signal to master control core by interrupt signal end NFC_EINT
Piece U1 prompts main control chip U1 to have information to need to handle, and reset signal end NFC_RST is used to receive answering for main control chip U1 output
Position signal, with the system reset before being initialized.
NFC read-write chip U2 passes through the first radio frequency transmitting terminal RFO1, first radio frequency reception end RFI1, described the
Two radio frequency transmitting terminal RFO2 and second radio frequency reception end RFI2 are connect with NFC conditioning circuit 11, and carry out the friendship of NFC signal
It changes, NFC read-write chip U2 is by outputing control signals to the auxiliary end CDMP2 of the first auxiliary end CDMP1 and second, for controlling the
One radio frequency transmitting terminal RFO1, first radio frequency reception end RFI1, the second radio frequency transmitting terminal RFO2 and second radio frequency
The signal of receiving end RFI2 transmits or stops transmission.
In an alternative embodiment, the NFC read-write chip U2 model ST21NFCD.
ST21NFCD inner wafer has the function of power management and battery voltage monitoring, and has firing frequency sensitivity,
Therefore corresponding configuration miniature antenna, in the present embodiment, NFC circuit also has crystal oscillator (not shown go out), for being NFC read-write chip
U2 provides clock reference, while chip has high-output power, so that DC/DC booster becomes non-essential external member
Part；Above-mentioned advantage all facilitates to save element cost and circuit board space.
As shown in figure 4, Fig. 4 is the circuit structure signal of 11 1 embodiment of NFC conditioning circuit in the utility model NFC circuit
Figure, in the present embodiment, the NFC conditioning circuit 11 include first antenna terminal T1, the second antenna terminal T2, first resistor R1,
Second resistance R2,3rd resistor R3, the 4th resistance R4, first capacitor C1, the second capacitor C2, third capacitor C3, the 4th capacitor C4,
5th capacitor C5, the 6th capacitor C6, the 7th capacitor C7, the 8th capacitor C8, the 9th capacitor C9, the tenth capacitor C10, the 11st capacitor
C11, the first inductance L1 and the second inductance L2；
The first end of the first resistor R1 is connect with first radio frequency reception end RFI1, and the of the first inductance L1
One end and first radio frequency send the end RFO1 and connect, and the second of the second end of the first inductance L1, the first resistor R1
The first end at end, the first end of the first capacitor C1, the first end of the third capacitor C3 and the 4th capacitor C4 interconnects,
The first end of the second resistance R2 is connect with second radio frequency reception end RFI2, the first end of the second inductance L2 and institute
State the second radio frequency transmitting terminal RFO2 connection, the second end of the second resistance R2, the second end of the second inductance L2, described
The second end of the first end of two capacitor C2, the first end of the 5th capacitor C5 and the 6th capacitor C6 interconnects, and described second
The second end of capacitor C2 and the second end of the first capacitor C1 are grounded, the second end of the third capacitor C3, the described 4th
The second end of capacitor C4, the first end of the 7th capacitor C7, the first end of the 8th capacitor C8, the 9th capacitor C9
First end, the first end of the 3rd resistor R3 and first antenna terminal T1 interconnection, the second end of the 5th capacitor C5,
The second end of the 6th capacitor C6, the second end of the 9th capacitor C9, the first end of the tenth capacitor C10, described
The first end of 11 capacitor C11, the second end of the 3rd resistor R3 and the second antenna terminal T2 interconnection, the 7th electricity
Hold the second end of C7, the second end of the 8th capacitor C8, the first end of the 4th resistance R4 and first auxiliary end
CDMP1 interconnection, the second end of the tenth capacitor C10, the second end of the 11st capacitor C11, the 4th resistance R4
Second end and the second auxiliary end CDMP2 interconnection.
As shown in figure 5, Fig. 5 is the electrical block diagram of another embodiment in the utility model NFC circuit, the present embodiment
In, the NFC circuit further includes NFC interface circuit, and the NFC interface circuit includes NFC interface 20 and power circuit 30, described
NFC read-write chip U2 is connect with the main control chip U1 and the power circuit 30 respectively through the NFC interface 20；
The power circuit 30, for exporting DC power supply to the NFC read-write chip U2.
In the present embodiment, main control chip U1 is connect by NFC interface 20 with NFC read-write chip U2, is needed in main control chip U1
When safeguarding, plug replacement directly can be carried out from NFC interface 20, to reduce the maintenance cost of NFC circuit.
Power circuit 30 is used to provide working power for NFC read-write chip U2.
As shown in fig. 6, Fig. 6 is the electrical block diagram of one embodiment of power circuit in the utility model NFC circuit, this
In embodiment, the power circuit includes the 12nd capacitor C12, the 13rd capacitor C13 and voltage-stablizer U3, the 12nd capacitor
The power input of the first end of C12, the power end VCC of power circuit 30 and the voltage-stablizer U3 interconnects, the 13rd electricity
Hold the power output end interconnection of the first end of C13, the power output end of the voltage-stablizer U3 and the power circuit 30, described the
The ground terminal of the second end of 12 capacitor C12, the second end of the 13rd capacitor C13 and the voltage-stablizer U3 is grounded.
In the present embodiment, voltage-stablizer U3 can be linear voltage regulator U3, NFC read-write chip U2 can according to different voltages specification from
The power input or power output end of power circuit 30 obtain DC voltage, can specifically be selected according to the actual situation,
It is not particularly limited herein.12nd capacitor C12 and the 13rd capacitor C13 is for filtering.
The utility model also proposes a kind of terminal device, which includes NFC circuit as described above, NFC electricity
The specific structure on road is referring to above-described embodiment, since this terminal device uses whole technical solutions of above-mentioned all embodiments,
Therefore at least there are all beneficial effects brought by the technical solution of above-described embodiment, this is no longer going to repeat them.
The above is only the preferred embodiment of the present invention, and therefore it does not limit the scope of the patent of the utility model,
It is all under the inventive concept of the utility model, equivalent structure made based on the specification and figures of the utility model becomes
It changes, or directly/be used in other related technical areas indirectly and be included in the scope of patent protection of the utility model.
Claims (8)
1. a kind of NFC circuit, which is characterized in that including main control chip, NFC read-write chip and NFC antenna circuit, the master control core
The model MT6580 of piece；
The main control chip, the NFC read-write chip and the NFC antenna circuit are sequentially connected；
The NFC antenna circuit, for mutually carrying out NFC signal communication between external NFC device；
The NFC read-write chip, for when establishing connection with external NFC device feedback link signal to the master control core
Piece；
The main control chip, the connection signal correspondence for being fed back according to the NFC read-write chip output control signals to described
NFC read-write chip, to control the read-write operation that the NFC read-write chip carries out NFC signal.
2. NFC circuit as described in claim 1, which is characterized in that the NFC antenna circuit includes NFC conditioning circuit and day
Line, the NFC conditioning circuit are connected between the NFC read-write chip and the antenna；
The antenna, for transmitting NFC signal by near-field coupling and external NFC circuit；
The NFC conditioning circuit, for carrying out impedance matching and filtering processing to the NFC signal.
3. NFC circuit as claimed in claim 2, which is characterized in that the NFC read-write chip is equipped with power end, clock is believed
Number end, data signal end, interrupt signal end, reset signal end, the first auxiliary end, the second auxiliary end, the first radio frequency reception end, the
One radio frequency transmitting terminal, the second radio frequency reception end, the second radio frequency transmitting terminal, it is the clock signal terminal, the data signal end, described
Interrupt signal end and the reset signal end are connect with the signal end of the main control chip respectively, first auxiliary end, described
Second auxiliary end, first radio frequency reception end, the first radio frequency transmitting terminal, second radio frequency reception end, described second
Radio frequency transmitting terminal is connect with the NFC conditioning circuit respectively.
4. NFC circuit as claimed in claim 3, which is characterized in that the NFC read-write chip model ST21NFCD.
5. NFC circuit as claimed in claim 3, which is characterized in that the NFC conditioning circuit includes first antenna terminal,
Two antenna terminals, first resistor, second resistance, 3rd resistor, the 4th resistance, first capacitor, the second capacitor, third capacitor,
Four capacitors, the 5th capacitor, the 6th capacitor, the 7th capacitor, the 8th capacitor, the 9th capacitor, the tenth capacitor, the 11st capacitor, first
Inductance and the second inductance；
The first end of the first resistor is connect with first radio frequency reception end, the first end of first inductance and described the
The connection of one radio frequency transmitting terminal, the second end of first inductance, the second end of the first resistor, the first capacitor first
The first end interconnection at end, the first end of the third capacitor and the 4th capacitor, the first end of the second resistance with it is described
The connection of second radio frequency reception end, the first end of second inductance are connect with the second radio frequency transmitting terminal, the second resistance
Second end, the second end of second inductance, the first end of second capacitor, the first end of the 5th capacitor and described
The second end of 6th capacitor interconnects, and the second end of second capacitor and the second end of the first capacitor are grounded, and described the
The second end of three capacitors, the second end of the 4th capacitor, the first end of the 7th capacitor, the 8th capacitor first
End, the first end of the 9th capacitor, the first end of the 3rd resistor and first antenna terminal interconnection, the 5th electricity
The second end of appearance, the second end of the 6th capacitor, second end, the first end of the tenth capacitor, institute of the 9th capacitor
State the first end of the 11st capacitor, the second end of the 3rd resistor and second antenna terminal interconnection, the 7th capacitor
Second end, the second end of the 8th capacitor, the first end of the 4th resistance and first auxiliary end interconnection, described the
The second end of ten capacitors, the second end of the 11st capacitor, the second end of the 4th resistance and second auxiliary end are mutual
Even.
6. the NFC circuit as described in claim 1-5 any one, which is characterized in that the NFC circuit further includes NFC interface
Circuit, the NFC interface circuit include NFC interface and power circuit, the NFC read-write chip through the NFC interface respectively with
The main control chip is connected with the power circuit；
The power circuit, for exporting DC power supply to the NFC read-write chip.
7. NFC circuit as claimed in claim 6, which is characterized in that the power circuit includes the 12nd capacitor, the 13rd electricity
Hold and voltage-stablizer, the power input of the first end of the 12nd capacitor, the power end of power circuit and the voltage-stablizer are mutual
Even, the power output end of the first end of the 13rd capacitor, the power output end of the voltage-stablizer and the power circuit is mutual
Even, second end, the second end of the 13rd capacitor and the ground terminal of the voltage-stablizer of the 12nd capacitor are grounded.
8. a kind of terminal device, which is characterized in that including the NFC circuit as described in claim 1-7 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920227600.XU CN209357068U (en) | 2019-02-20 | 2019-02-20 | NFC circuit and terminal device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920227600.XU CN209357068U (en) | 2019-02-20 | 2019-02-20 | NFC circuit and terminal device |
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| Publication Number | Publication Date |
|---|---|
| CN209357068U true CN209357068U (en) | 2019-09-06 |
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ID=67803772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920227600.XU Active CN209357068U (en) | 2019-02-20 | 2019-02-20 | NFC circuit and terminal device |
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| CN (1) | CN209357068U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110808762A (en) * | 2020-01-07 | 2020-02-18 | 易兆微电子（杭州）有限公司 | Crystal-free method for NFC chip |
| WO2021203227A1 (en) * | 2020-04-07 | 2021-10-14 | 华为技术有限公司 | Data transmission method and data transmission apparatus based on inter-integrated circuit protocol |
-
2019
- 2019-02-20 CN CN201920227600.XU patent/CN209357068U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110808762A (en) * | 2020-01-07 | 2020-02-18 | 易兆微电子（杭州）有限公司 | Crystal-free method for NFC chip |
| WO2021203227A1 (en) * | 2020-04-07 | 2021-10-14 | 华为技术有限公司 | Data transmission method and data transmission apparatus based on inter-integrated circuit protocol |
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